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(No Model.) 5 Sheets-Sheet 1. J. PRICE. MACHINE FOR MANUFACTURINGMULTIPLE THROW CAMS.

Patented July 28, 1896.

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J. PRICE.

MACHINE ron MANUFACTURING MULTIPLE THROW ems.

No. 564,800. Patented July 28, 1896.

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J. PRICE. MACHINE FOR MANUFACTURING MULTIPLE THROW CAMS.

Patented July 28, 1896;

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J. PRICE. MAGHYINE FOR muumcwumm MULTIPLE THROW ems.

No. 564,800. Patented July 28, 1896.

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UNITED STATES PATENT OEFIcE.

JOHN PRICE, OF LONDON, ENGLAND, ASSIGNOR OF FOUR-FIFTHS TO DICK EDWARDSRADOLYFFE, ALFRED HENRY SMITH, THOMAS HANN, AND IVILLIAM BROMLEY, OFSAME PLACE.

MACHINE FOR MANUFACTURING MULTIPLE-THROW CAMS.

SPECIFICATION forming part of Letters Patent No. 564,800, dated July 28,1896.

Application filed April 6, 1896. Serial No. 586,320. (No model.)

To all whom, it may concern:

Be it known that 1, JOHN PRICE, mechanical engineer, a subject of theQueen of Great Britain, residing at Upper Kennington Lane, London,England, have invented a certain new and useful Machine fortheManufacture of Multiple-ThrowOams, of which the following is aspecification.

In the drawings, Figure l is an'elevation of the cam and connections.Fig. 2 is a diagram illustrating the manner in which the shape of thecam is laid out. Fig. 3 is a front elevation of the cam-forming machine.Fig. 4 is an elevation at the right-hand side. Fig. 5 is a plan view.Fig. 6 is apartial sectional plan of the compound lever. Fig. 7 is apartial side elevation of the work-table and shaft, and Fig. 8 is a planof the same, and Fig. 1 illustrates a bent arm and cam.

The object of this invention is to provide a machine for the mechanicalmanufacture (without the employment of a model or templet) of plate orcylindrical cams capable of imparting a number of equal throws at eachrevolution, and whereby the curved paths so produced are automaticallyformed and are of symmetricallyperfect character. Such cams, whenmounted to be rotated, are advantageously employed for transmittingmotion and communicating an increased speed to other parts of machinery,such as, for example, transmitting motion from a drivingaxle to a wheelor shaft to be driven.

These cams are particularly advantageous for use in the driving'gear ofvelocipedes, as is illustrated by diagram Fig. 1 of the accompanyin gdrawings,where A is one of these multi ple-throw cams of plate variety,keyed on a driving-shaft A. B is a swinging arm pivoted at one end N tothe framework and provided at its lower end with a bowl entering thecam-groove. At the bowl end of the arm B is jointed a connecting-rod Oto drive a crank O on disk 0 Such cam-grooves may obviously be formed,in some cases, upon the curved surface of a cylinder, as, for example,is shown by the diagram Fig. 1*, where A is the cam on a driving-shaftA. Abell-crank lever is pivoted at N, one arm, B, having a bowl operatedby the cam, while the other arm, B, is jointed to the connecting-rod.

The machine hereinafter described is capable of being caused to cutmultiple-throw 'cam-groovesupon such a flat surface as at Fig. l or acylindrical surface as at Fig. 1

In order that the system of action of the machine for the manufacture ofsuch cams, and as hereinafter fully described, may be readilyunderstood, I will first describe what I may call the elements of themechanism I employ according to my invention.

In order to produce a plate-cam, say, of three-throw character, theplate A from which the cam is to be formed is fixed to and carried by arevolving table D, as is indicated by a diagram view, Fig. 2. Above thetable D is a two-armed leverB B, capable of being rocked on a center Nby a connecting-rod O and a crank-disk C the outer end of the lever-armB carrying a cutter or rotary milling-tool to act upon and cut the cam.The various parts are so relatively operated that While the table D isrevolved once the tool-arm- B is rocked toward the center of the camthree times and is rocked to the out-er extent of the cam-groove threetimes, and a three-throw cam is thereby formed. When cylindrical camsare to be cut, the table D is held stationary, while the cylinder to becut is mounted thereonbetween centers and is revolved at the same rateas the table D would be revolved if-cuttin g a fiat cam.

In the machine hereinafter fully described the number of throws of thecam to be produced can be varied, while the throws of the said cam canalso be made to suit any throw of the driven crank at C Fig. 1, or anylength of swinging arm B, Fig. 1.

The rotary table D, onto which the plate to.

be cut is fixed, is fitted witha lower extension or neck D, and has aconed base D held by bearing-pieces D to a laterally-sliding bed Dcapable of being slid transversely by screw-shaft D and hand-wheel D,Fig. 3. The upper bed D is carried on transverse guides on a lowerlongitudinally-adjustable bed D capable of being operated by screwshaftD and hand-wheel D The bed D is carried on'longitudinal guides formed onthe frame E of the machine. By this construction the table D is capableof being rotated, while it may be adjusted into any desired position,both transversely and longitudinally, upon the slides.

In order to give the table D rotary motion, (in whatever position it maybe placed transversely or longitudinally,) the neckD is fitted with atoothed wheel F, with which gears a pinion F, the pivot of which latteris adj ustably carried in slots formed in straps F mounted to looselyembrace the neck D of the table D. Pivoted to and extending from thestrap F extends a pair of links G, jointed to a pair of links H, whichlatter pivot on a vertical counter-shaft J, carried in bracketbearings JJ 2 from the frame E of the machine. The links Gand H are adjustable inlength and carry a spur-wheel G, gearing with a pinion H, held to thecounter-shaft J by a feather and groove, so as to allow the latter to beadjusted vertically. By these means, which permit of varying the size ofthe gear-wheels, any desired ratio of speed may be obtained between theshaft J and the table D, while the links also allow of the table beingadjusted horizontally in any direction.

The counter-shaft- J is conveniently rotated by, say, a worm-wheel K,(held thereto by a feather in the groove of the shaft J operated by aworm K on a horizontal shaft K held in brackets from the frame E of themachine, and driven bybelt and cone pulleys K Fig. 5.

The vertical cutter spindle L is carried above the table D by means of aforked bearing-bracket M, supported by vertical guides from theframe-standard E, upon which it may be adjusted vertically by ordinarymeans, say by being connected to a vertical screw-shaft within thestandard E, (not shown in the drawings,) and such screw-shaft may berotated by worm-gearing through a handle located as at M at Fig. 3. Thebearings of the bracket M carrya vertical shaft N, extending upward, andbetween the fork of the bracket M and pivoting loosely upon the shaft Nas a fulcrum is located a compound two-armed lever B B. (Shown detachedin plan view at Fig. 6.)

The front arm B of the lever carries the cutter-spindle L, and isadjustable in guides lengthwise upon the back arm B, while the latterarm B is also formed with slotted horizontal guides to carry anadjustable bracket B to which is jointed a laterally-extendingconnecting-rod O, the opposite end of which latter takes onto acrank-pin C on a crankdisk 0 keyed onto the upper end of thecounter-shaft J. The rotation of the shaft J will thus rock thelever-arms B B, and the extent of such motion may be regulated byadjusting the crank-pin in the guide-groove C of the crank-disk O.

In order to allow of the cutter-spindle L, its carrying-lever B B, andbracket M being adjusted vertically, the upper end of shaft J is carriedby a bracket J 3 below the crankdisk 0 so that when the bracket M israised or lowered the shaft J is also raised or lowered the groove andfeathered connections of the various parts with such shaft allowing ofthe motion.

It will now be understood that the cutterspindle L can be rocked orgiven radial reciprocations of any required extent, and the number ofsuch reciprocations may bear any required proportion to the rotation orrotations of the table D.

To rotate the cutter-spindle L while allowing of its radial motions andof the vertical adjustment of its carrying-arm B, two pairs of jointedlinks P P are provided, connecting and loosely embracing the shaft N andthe cutter-spindle L, respectively. Upon the shaft N is keyed a pinionN, gearing with an idle-pinion Q on the joint-pin of links P P. Thispinion Q gears with a pinion L, keyed or held by I feather and groove,to the cutterspindle L, so that upon revolving the shaft N thecutter-shaft L is also revolved, whatever position or radial translationmotion is given to it.

The shaft N for communicating rotary motion to the cutter-bar L isextended upward and supported by a bearing-bracket E. Above the bearingE and on the shaft N, there is located a bevel-wheel N provided with arib or feather to take into the groove of the shaft N, whereby thevertical adjustment of the bracket M, and consequently the rise or fallofthe shaft N, is allowed for. The bevel-wheel N gears withabevel-wheelR, carried on a shaft R, driven by speed-pulleys, by whichmotion is communicated, through the shaft N, to the cutter-bar L.

When the multiple-throw cam is to be out upon a cylindrical block, thelatter is mounted between centers S, as shown at Figs. 7 and 8. Thegearing for rotating the table D is disconnected and the latter heldstationary, while the cylindrical block A is rotated through theuniversally-jointed shaft T, supported by a bearing-bracket T, carriedfrom and revoluble upon the shaft J. The shaft T is driven when requiredby bevel-wheel '1 thereon from a pinion T mounted on the shaft J by afeather and groove. It will be understood that the cylinder to be cut isso speeded as to be revolved in the same ratio to the reciprocation ofthe cutter as would be the case with the rotating table D.

It should be observed that by this machine multiple-throw cams of thecharacter shown at Figs. 1, 1 and 2 are produced by revolving the plateor block from which the cam is to be formed, while the cutter issimultaneously, and during one revolution of the plate or block, causedto perform movements identical with the motions of translation whichwould be performed by the bowl, Fig. 1, at the end of the arm B. Beyondthis, it should be noted that with this machine came to give any numberof throws can be formed too by varying the relative number ofrevolutions of the crank-disk C Fig. 2, with regard to the table D or tothe block being out. The throw of the cams to be formed can be alsoregulated according to the throw given by the said crank-disk O and acam can be formed to suit any length of arm such as B, Figs. 1 or 1, byproper horizontal adjustment of the lever-arm B, or of the slide B ofthe lever-arm B, and the position of the center N, Fig. 1, relative tothe cam can be varied. In fact, the proportions of the cams produced canbe varied to suit any position of the centers or proportions of themoving parts of the machinery which the cams are to actuate.

I claim- 1. In a machine for the manufacture of multiple-throw plate orcylindrical cams, the combination with a horizontally-adjustablework-table D for carrying the work to be cut, and means for mechanicallyrotating the said table; of a vertical cutter-spindle L above thework-table D, means for rotating the spindle L, a fulcrumed horizontaltwo-armed lever B B, a fixed bracket M to carry the fulcrum of lever BB, a bearing on the arm B to carry the rotary cutter-spindle L, and anadjustable-throw crank connected with the arm B to rock the said lever BB and give the required number of throws to the cutter-spindlerelatively to one rotation of the worktable substantially as set forth.

2. In a machine for the manufacture of multiple-throw plate orcylindrical cams the combination with a horizontally-adj ustableworktable D for carrying the work to be cut, and means for rotating thework-table of a driven rotary vertical shaft J, an adj ustable-throwcrank on shaft J, a connecting-rod C therefrom, a horizontal two-armedrock-lever B B carried on a fulcrum from the framework, ahorizontallyadjustable connection B on lever-arm B with theconnecting-rod 0, whereby the lever B B is rocked, a verticalcutter-carrying spindle L carried by the leverarm B, and means foraxially rotating thesaid spindle L, and whereby the cutter is rocked aproper number of times to arevolution of the work-table substantially asset forth.

3. In a machine for the manufacture of multiple-throw plate orcylindrical cams, the combination with a horizontally-adjustable table Dcapable of being rotated, for carrying the plate or cylinder to be cut,a driven vertical shaft J ,variable-speed tooth-gearing and linkconnections between shaft J, and table D, for rotating the table ata-required relative speed; of a forked vertically-adjustablebracket-bearing M located above the table D, a vertical driven shaft Ncarried by the bracket M, a two-armed horizontal lever B B looselyfulcrumed on the shaft N between the arms of bracket M, a verticalcutter-carrying spindle L carried by lever-arm B,linked variable-speedgearingL' Q N between driven shaft N and cutter-spindle L and gearingfor rotating driven shaft N, a variable-throw crank-disk G on shaft J,connecting rod 0 therefrom to lever-arm B to give a desired number ofoscillations to the lever B B and cutter-spindle L, during onerevolution of the table D as set forth.

JOHN PRICE.

Witnesses:

E. G. BREWER, L. W. ROGERS.

